title: External quality assurance.
authors.affiliation: Biochemistry Department, Bradford Royal Infirmary, Yorkshire, UK.
authors.forename: A D
authors.initials: AD
authors.lastname: Hirst
mesh_terms: D000465:Algorithms; D006801:Humans; D010336:Pathology / Q000592:standards*; D011785:Quality Assurance, Health Care; D015203:Reproducibility of Results; D013223:Statistics as Topic; D006113:United Kingdom